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1. 80 x 50 on VGA
=================
mov ax,1202h ; select 400 scan line mode
mov bl,30h
int 10h
mov ax,3 ; select 80 x 25 16 colour mode
int 10h
mov ax,1112h ; load 8x8 character set into RAM
mov bl,0
int 10h
2. 80 x 43 on EGA
=================
mov ax,3 ; establish 350 scan line mode
int 10h ; and 80 x 25 16 colour mode
mov ax,1112h ; 8x8 character set
mov bl,0
int 10h
mov ax,40h ; update cursor size/ pointers
mov es,ax
mov dx,es:[63h]
mov ax,060ah
out dx,ax
mov ax,000bh
out dx,ax
mov ax,12h ; set up new prtscr routine
mov bl,20h
int 10h
Warnings:
=========
DOS's ANSI.SYS prior to DOS 5 has no comprehension of screens having more
than 25 lines!
Reference:
"Programmer's Guide to PC and PS/2 Video Systems": author Richard Wilton.
Microsoft Press 1988. ISBN 1-55615-103-9
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